journal article·2026-06

Ultra‐High Dielectric Acceptor Enables 21% Efficiency and Thickness‐Insensitive Organic Solar Cells

Youdi Zhang, Hansheng Chen, Ailing Yin, Hao Wang, Nan Ye, Shuai Xu, Pai Peng, Peng Zhang, Junfei Zhu, Boyao Zhang, Hongxiang Li, Chen Xie, Guangye Zhang, Xiaotian Hu, Lei Zhu, Long Ye, Huiliang Sun, Shenghua Liu, Qingqing Yang, Tonghui Wang, Shouguo Wang, Qing Jiang, Chunhui Duan, Yiwang Chen, Feng Liu, Yongfang Li

Advanced Materials· Volume 38· Issue 36
Publisher page

Abstract

ABSTRACT Dielectric constant (ε r ) of non‐fullerene acceptors (NFAs) is a crucial parameter in organic solar cells (OSCs), significantly influencing exciton dissociation efficiency and charge recombination dynamics. However, the state‐of‐the‐art NFAs typically exhibit relatively low dielectric constants (ε r ≈ 3–5), which inherently limit device performance by promoting substantial recombination losses. Herein, a new guest acceptor named L8‐BO‐FO is reported by replacing the branched alkyl chains on L8‐BO with dimethyl ether units, which presents a higher ε r value of 7.41 than that of L8‐BO (4.57). Subsequently, the high‐ε r L8‐BO‐FO was introduced into the PM6:L8‐BO system to improve the dielectric property of the active layer, which, encouragingly, increases the ε r value of the active layer, accelerates exciton dynamics, and suppresses the nonradiative charge recombination. As a result, the power conversion efficiency (PCE) of the ternary OSCs is boosted up to 21.0%. Surprisingly, the ternary OSCs maintained an outstanding PCE of 19.1% even when the active‐layer thickness increased to 300 nm. This work brings new insights into the design of high‐performance OSCs with excellent thickness tolerance by dielectric engineering, which is essential for high‐throughput and scale‐up fabrication of OSCs.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Chemistry Key Laboratory of Advanced Green Functional Materials Changchun Normal University Changchun China

School of Materials Shenzhen Campus of Sun Yat‐Sen University Shenzhen Guangdong China

Key Laboratory of Automobile Materials and School of Materials Science and Engineering Ministry of Education Jilin University Changchun China

College of Materials and Energy Guang'an Institute of Technology Guang'an Sichuan P. R. China

College of New Materials and New Energies Shenzhen Technology University Shenzhen China

College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC) Nanchang University Nanchang China

Frontiers Science Center For Transformative Molecules In situ Center for Physical Science and Center of Hydrogen Science School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai China

School of Materials Science & Engineering Tianjin University Tianjin China

Guangdong Engineering Technology Research Center For Photoelectric Sensing Materials & Devices Guangzhou Key Laboratory of Sensing Materials & Devices Center For Advanced Analytical Science School of Chemistry and Chemical Engineering Guangzhou University Guangzhou Guangdong P. R. China

School of Chemistry and Chemical Engineering Gannan Normal University Ganzhou Jiangxi P. R. China

School of Materials Science and Engineering Anhui Provincial Key Laboratory of Magnetic Functional Materials and Devices Center for Free Electron Laser & High Magnetic Field Anhui University Hefei China

Institute of Polymer Optoelectronic Materials and Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials National Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou P. R. China

State Key Laboratory of Fluorinated Functional Membrane Materials and Dongyue Future Hydrogen Energy Materials Company Zibo China

Beijing National Laboratory For Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing China

Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor‐Optoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou China

Funding

Natural Science Foundation of Anhui Province · Guangdong Innovative and Entrepreneurial Research Team Program · National Natural Science Foundation of China

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